MIL --- PRF --- 51191G(EA)
3.5.2 Identification and markings. Each heater shall contain the following indentification
information, clearly and legibly marked: "Heater, air, electric, filter unit, M3"; 27.5 Vdc rat-
ing, nominal maximum power rating in watts at the specified 27.5 Vdc input voltage; lot num-
ber, model and/or serial number, and contract number. Electrical leads between the
controller and heater shall be marked with permanent markings on both sides of the electrical
connectors to ensure that leads are identifiable for correct reconnection. The inlet and outlet
airflow ports shall be clearly and legibly marked. When the heater is not energized, the con-
trol knob shall clearly indicate "off." The direction of turn for warmer air shall be marked on
the controller. Clarity of the identification information and markings shall not be degraded
by temperature and humidity stress.
3.5.3 Workmanship. The heater shall be free from missing or loose parts; dented, cracked,
or chipped surfaces; oil or foreign matter adhering to outside surface; and foreign matter
blocking the air ports.
3.5.4 Color and finish. The color of the exterior of the heater shall be white or off --- white
with gloss finish except for threads, controller knob, electrical connectors and plated parts,
and any other area designated on Drawing 5 --- 19 --- 1782. All external metallic surfaces or
coatings applied to such surfaces shall resist corrosion and heat stress.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classi-
fied as follows:
(a) First article inspection (see 4.2)
(b) Conformance inspection (see 4.3)
4.2 First article inspection
4.2.1 Sample. The first article sample shall consist of 20 heaters manufactured using the
same methods, materials, equipment, and processes as will be used during regular production
(see 6.2). Five heaters are allocated to each of the four sample groups in table I. The first
article sample shall be submitted for inspection and approval in accordance with the terms of
the contract.
4.2.2 Inspections to be performed. The first article sample heaters shall be inspected and
tested in the sequence shown in table I.
4.2.3 Acceptance criteria. If any first article sample item fails to comply with any of the
applicable requirements, the first article sample shall be rejected. The Government reserves
the right to terminate inspection upon any failure to comply with any of the requirements.
The contractor shall obtain written approval from the contracting activity prior to proceeding
with regular production.
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